Billy Bob Thornton watches 'My Little Pony' with his daughter and his favourite character is Fluttershy.

The 61-year-old actor has admitted he watches the children's cartoon with his youngest daughter Bella, 12, and says he likes the yellow and pink pony Fluttershy because she "talks like Marilyn Monroe."

Speaking on 'Late Night with Seth Meyers', the 'Fargo' actor said: "[My daughter] likes Twilight Sparkle. I like Rainbow Dash, and Fluttershy because she talks like Marilyn Monroe."

The 'Bad Santa 2' star - who is also father to Amanda, 37, William, 23, and Harry, 22 - also said he enjoys watching the show with Bella because the "underlying themes" can actually be "pretty heavy".

He explained: "One way or another we found one of her old books recently, and we started watching the show. And the underlying themes are actually pretty heavy. There was one about 'Big Brother' and '1984' and all that kind of stuff. It's really cool."

And the 'Sling Blade' actor also noted that his daughter now watches the 'My Little Pony' spin-off series 'Equestria Girls' - which features the same characters as the original show but is set in high school - as she's a little too old for the original show.

He said: "My daughter and I read the 'My Little Pony' books. And there was the little kid version of 'My Little Pony', but now there's this other version of it for older kids.

"They've got this other show called 'Equestria Girls' which is the pony characters but they're in another dimension, and they're now teenage girls who go to high school.

"They're the same characters, only now they're little girls and not horses. So now that she's 12 we watch that mostly."